Jerry Bao created SOLR-12088:
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             Summary: Shards with dead replicas cause increased write latency
                 Key: SOLR-12088
                 URL: https://issues.apache.org/jira/browse/SOLR-12088
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
          Components: SolrCloud
    Affects Versions: 7.2
            Reporter: Jerry Bao


If a collection's shard contains dead replicas, write latency to the collection 
is increased. For example, if a collection has 10 shards with a replication 
factor of 3, and one of those shards contains 3 replicas and 3 downed replicas, 
write latency is increased in comparison to a shard that contains only 3 
replicas.

My feeling here is that downed replicas should be completely ignored and not 
cause issues to other alive replicas in terms of write latency.



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